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MA: Fachverband Magnetismus

MA 15: Magnetic measurement methods

MA 15.10: Talk

Tuesday, March 17, 2015, 11:45–12:00, H 1012

Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems — •Dibyendu Roy^1,2,3, Luyi Yang⁴, Scott A. Crooker⁴, and Nikolai A. Sinitsyn² — ¹Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany — ²Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA — ³Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA — ⁴National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

We develop and apply a minimally invasive approach for characterization of inter-species spin interactions by detecting spin fluctuations alone. We consider a heterogeneous two-component spin ensemble in thermal equilibrium that interacts via binary exchange coupling, and we determine cross-correlations between the intrinsic spin fluctuations exhibited by the two species. Our theoretical predictions are experimentally confirmed using two-color optical spin noise spectroscopy on a mixture of interacting Rb and Cs alkali vapors [arXiv:1408.5399]. The results allow us to explore the rates of spin exchange and total spin relaxation under conditions of strict thermodynamic equilibrium.